The life of a Radio Shack record player is normally distributed with a mean of 3 years and a standard deviation of 1 years. Radio Shack guarantees its record players for 2 years.
Find the probability that a record player will last less than 2 years?
Answer:
the probability that a record player will last less than 2 years is 0.1586
Step-by-step explanation:
Given that:
A mean which is normally distributed = 3
and a standard deviation = 1
The objective is to find that a record player will last less than 2 years
Let X be the random variable
i.e
From the standard normal tables :
P(X < 2) = 0.1586
Therefore; the probability that a record player will last less than 2 years is 0.1586
Answer:
b. 45deg
Step-by-step explanation:
see attached
Step-by-step explanation:
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Answer:
5
Step-by-step explanation:
the answer is 5 because when you add up all the numbers and divide it by how many they are, the answer is 5
A set of data is given. It is required to find the first, second, and third quartile.
The given data is:
Recall that the lower quartile Q₁, or the first quartile, is the median of the lower half of the data in a set.
The lower half is:
Find the median of the lower half to get the first quartile, Q₁:
Hence, Q₁=9.
Recall that the second quartile Q₂ is the same as the median of the data.
The median is the middle element or the mean of two middle elements in a numerical data set with the elements ordered by their value.
Notice that the middle number is 15.
Hence, second quartile Q₂=15.
The upper quartile Q₃, or the third quartile, is the median of the upper half of the data in a set.
The upper half of the data is:
Calculate the median to find the third quartile, Q₃:
It follows that Q₃=17
The complete table is shown below: